tree: https://github.com/intel/linux-intel-lts.git 5.10/preempt-rt head: ab2a4c18536ed3f3ec2fbd942657b31d6f63fe7c commit: 85689867faad45d8385c0d0001395735c778d2e3 [19/26] Revert "xfrm: fix lock usage issue" config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/intel/linux-intel-lts/commit/85689867faad45d8385c0d000... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.10/preempt-rt git checkout 85689867faad45d8385c0d0001395735c778d2e3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the intel-linux-intel-lts/5.10/preempt-rt HEAD ab2a4c18536ed3f3ec2fbd942657b31d6f63fe7c builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from include/linux/mmzone.h:16, from include/linux/gfp.h:6, from include/linux/mm.h:10, from include/linux/bvec.h:14, from include/linux/skbuff.h:17, from include/net/xfrm.h:9, from net/xfrm/xfrm_state.c:18: net/xfrm/xfrm_state.c: In function 'xfrm_state_init': 178 | seqcount_##lockname##_t *____s = (s); \ | ^ include/linux/seqlock.h:184:42: note: in expansion of macro 'seqcount_LOCKNAME_init' 184 | #define seqcount_spinlock_init(s, lock) seqcount_LOCKNAME_init(s, lock, spinlock) | ^~~~~~~~~~~~~~~~~~~~~~ net/xfrm/xfrm_state.c:2666:2: note: in expansion of macro 'seqcount_spinlock_init' 2666 | seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation, | ^~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +178 include/linux/seqlock.h 55f3560df975f55 Ahmed S. Darwish 2020-07-20 156 ed3e453798d4f81 Mauro Carvalho Chehab 2020-10-13 157 /* 6dd699b13d53f26 Ahmed S. Darwish 2020-09-04 158 * typedef seqcount_LOCKNAME_t - sequence counter with LOCKNAME associated a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 159 * @seqcount: The real sequence counter 6dd699b13d53f26 Ahmed S. Darwish 2020-09-04 160 * @lock: Pointer to the associated lock a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 161 * 6dd699b13d53f26 Ahmed S. Darwish 2020-09-04 162 * A plain sequence counter with external writer synchronization by 6dd699b13d53f26 Ahmed S. Darwish 2020-09-04 163 * LOCKNAME @lock. The lock is associated to the sequence counter in the a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 164 * static initializer or init function. This enables lockdep to validate a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 165 * that the write side critical section is properly serialized. 6dd699b13d53f26 Ahmed S. Darwish 2020-09-04 166 * 6dd699b13d53f26 Ahmed S. Darwish 2020-09-04 167 * LOCKNAME: raw_spinlock, spinlock, rwlock, mutex, or ww_mutex. a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 168 */ a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 169 a28e884b966e713 Randy Dunlap 2020-08-16 170 /* e4e9ab3f9f91ad3 Peter Zijlstra 2020-07-23 171 * seqcount_LOCKNAME_init() - runtime initializer for seqcount_LOCKNAME_t e4e9ab3f9f91ad3 Peter Zijlstra 2020-07-23 172 * @s: Pointer to the seqcount_LOCKNAME_t instance 6dd699b13d53f26 Ahmed S. Darwish 2020-09-04 173 * @lock: Pointer to the associated lock e4e9ab3f9f91ad3 Peter Zijlstra 2020-07-23 174 */ e4e9ab3f9f91ad3 Peter Zijlstra 2020-07-23 175 267580db047ef42 peterz(a)infradead.org 2020-09-15 176 #define seqcount_LOCKNAME_init(s, _lock, lockname) \ 267580db047ef42 peterz(a)infradead.org 2020-09-15 177 do { \ 267580db047ef42 peterz(a)infradead.org 2020-09-15 @178 seqcount_##lockname##_t *____s = (s); \ 267580db047ef42 peterz(a)infradead.org 2020-09-15 179 seqcount_init(&____s->seqcount); \ 267580db047ef42 peterz(a)infradead.org 2020-09-15 180 __SEQ_LOCK(____s->lock = (_lock)); \ 267580db047ef42 peterz(a)infradead.org 2020-09-15 181 } while (0) 267580db047ef42 peterz(a)infradead.org 2020-09-15 182 :::::: The code at line 178 was first introduced by commit :::::: 267580db047ef428a70bef8287ca62c5a450c139 seqlock: Unbreak lockdep :::::: TO: peterz(a)infradead.org <peterz(a)infradead.org&gt; :::::: CC: Peter Zijlstra <peterz(a)infradead.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org